Escape of quantum information across an analogue black hole horizon

TL;DR

This paper uses quantum simulation of an analog black hole in a spin chain to study how quantum information, including entanglement and coherence, can escape across the horizon, shedding light on the black hole information paradox.

Contribution

It demonstrates the transfer of quantum information across an analog black hole horizon using a spin chain model, providing new insights into the information escape mechanism.

Findings

Page curve-like behavior observed in the model

Quantum resources transfer from interior to exterior

Supports the idea of information escape via radiation

Abstract

The complete evaporation of black holes, as a natural endpoint of Hawking radiation, gives rise to the black hole information paradox, which fundamentally challenges the principles of unitarity and information conservation in quantum mechanics. Although the AdS/CFT correspondence indicates that information is preserved during black hole evaporation, the precise mechanism by which it is recovered from the Hawking radiation remains an open question. To explore a potential resolution, we investigate information transfer in an analog black hole spacetime realized through position-dependent coupling in an XY spin chain. We derive and demonstrate Page curve-like behavior, and analyze the transmission of quantum resources, such as entanglement and coherence, across the effective horizon. Our results show that quantum resources initially localized within an interior subsystem can be transferred to the exterior via particle radiation through the horizon. This study provides a novel perspective from quantum simulation on how information may escape from black holes, thereby contributing to the further understanding of the black hole information paradox.